Open Channel Flow Meter Types

Special devices such as the parshall flume are required.

Open channel flow meter types.

Rivers streams canals and irrigation ditches provide examples of open channel flow. A third way of measuring of measuring open channel flow applications and historically the most common is the use of weirs and flumes. Examples of such structures include streams rivers irrigation ditches canals partially full pipes and water conveyance flumes. Open channel flow the flow of liquid through the open channel can be of several types like steady and unsteady flow laminar or turbulent flow or uniform or non uniform flow and finally sub critical critical and supercritical flow.

Measuring flow into a reservoir is a common application where open channel flow measurement comes into play. Open channel flowmeters most techniques used to meter flow in pipes are not applicable to flow in open channels. What is slightly confusing about this terminology is that the flow of liquids in partially filled pipes when not under pressure is also considered open channel flow. These dam like structures or overflows allow for a limited or concentrated free flow of liquids based on the unique shape and size of the structure.

All manner of primary structures have been used the world over including v notches rectangular weirs parshall flumes h flumes crump weirs flat v and many other hybrid versions. Open channel flow occurs when liquid flows in a conduit or channel with a free surface. Open channels are those natural and man made structures through which water flows with a free surface. It is subjected to atmospheric pressure.

Parshall flumes are one of the most widely used flumes for permanent flow monitoring. Partially filled pipes flow is also an example of open channel flow. This type of flow meter allows for a reading of the flowrate to be calculated. Open channel flow meters measurement of liquid in open channels include v notch weirs and flumes.

Open channel flow meters measure level flow rate and total volume of water flowing through weirs flumes channels and partially filled pipes. The parshall flume is an economical and accurate way of measuring the flow of water in open channels and non full pipes. Some of the more common methods currently in use to measure open channel flows are. The flow meters use a non contact level sensor to detect the water level and then calculates the flow rate and volume using the manning equation and characteristics of the channel.

Our open channel flow measurement section includes our microflow products which deliver accurate and efficient velocity flow measurement presented either as a stand alone device or as part of a complete area velocity flow meter system. Hs h hl flumes. Rivers natural and artificial canals streams channels etc.